I have a 67 chevelle malibu, but am doing a ss clone project with it. I have a 10 bolt posi traction in the car as is with the standerd 283 engine with th350 trans. Well, the trans is going to be up graded to th400 and am changing the engine to a 454 big block. Now I want to know rear end I should go with 12 bolt or orginal 10?

or you could get wierd and put a Dana 60 in the rear, they have been known to put up with a lot more abuse than a 9in. You're gunna have to get a bigger diff though, the internals of a 10-bolt are not heavy duty enough for that 454

Originally posted by 78novaman or you could get wierd and put a Dana 60 in the rear, they have been known to put up with a lot more abuse than a 9in. You're gunna have to get a bigger diff though, the internals of a 10-bolt are not heavy duty enough for that 454

[ November 14, 2002: Message edited by: 78novaman ]</p>

Actually I have been running an 8.2 10 bolt behind a 454 for a while now. The biggest factor is traction and gear ratio. If I had slicks and a posi turning 4.10 gears, yah, I would probably blow it up. But driving around with 3.08 and an open diff is no problem at all.

My buddy has a 72 firebird with a 455 stroked to a 474 in his car(3400lbs) runs 10.40s all day on a 10 bolt...needless to say I would run the 10 bolt till she blows then upgrade. Just me thought GL to ya!

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